High strength coupling Long Nut 1.Material:carton steel 2.Grade :4. ... .8 3.Finished:black,zinc 4.Certifica:ISO9001:2008 SepecificationHigh strength coupling Long Nut 1 Size of nuts : M3-M362 Material ... , lock washersSCREWS: machine screws, self tapping screws, set screws, hex socket head cap screws, woodscrews, self drilling screws Welcome you inquiry ...